CN110903048A - A kind of high activity ultrafine mineral admixture and preparation method thereof - Google Patents
A kind of high activity ultrafine mineral admixture and preparation method thereof Download PDFInfo
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- 230000000694 effects Effects 0.000 title claims abstract description 43
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 41
- 239000011707 mineral Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000010438 granite Substances 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000010440 gypsum Substances 0.000 claims abstract description 15
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 15
- 230000003213 activating effect Effects 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 43
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 238000005242 forging Methods 0.000 claims description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 9
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 3
- 229940044172 calcium formate Drugs 0.000 claims description 3
- 235000019255 calcium formate Nutrition 0.000 claims description 3
- 239000004281 calcium formate Substances 0.000 claims description 3
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 239000012190 activator Substances 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 11
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 8
- 239000004568 cement Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910018516 Al—O Inorganic materials 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005036 potential barrier Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- -1 silicon-aluminum-calcium Chemical compound 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-activity ultrafine mineral admixture and a preparation method thereof, wherein the high-activity ultrafine mineral admixture is prepared from the following raw materials in percentage by weight: 20-60% of granite powder, 5-25% of furnace slag, 20-50% of fly ash, 0.1-10% of excitant, 0.1-3% of reinforced activating material and 1-5% of desulfurized gypsum. The high-activity ultrafine mineral admixture is prepared by mixing the granite powder, the furnace slag, the fly ash, the excitant, the reinforced activating material and the desulfurized gypsum, and performing coarse grinding and fine grinding, and the preparation process is simple, and the high-activity ultrafine mineral admixture reaches the standard of above S95 level.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a high-activity ultrafine mineral admixture and a preparation method thereof.
Background
With the increasing energy situation and the increasing industrial solid waste, environmental protection and ecological sustainable development become problems to be solved urgently. Granite powder is powder produced in stone saw blade, cutting, grinding disc and other processing processes in stone factories, the particle size distribution of the powder is not uniform, the recovery rate is extremely low, most of the powder is piled and untreated, the environment such as surrounding atmosphere and soil is polluted, a large amount of resource waste is caused, and the circular sustainable economic development is restricted.
The granite powder has chemical components similar to industrial fly ash, and the silicon dioxide and the aluminum oxide account for more than 90 percent. At present, researchers have studied the feasibility of replacing cement with granite powder as an admixture, and the problems of granite powder pollution and resource waste are solved by carrying out complex doping on the granite powder and the cement instead of mineral admixtures such as silica fume, fly ash and the like. Chinese patent CN106242349A discloses a granite stone powder composite mineral admixture and a preparation method thereof, wherein the granite stone powder composite mineral admixture comprises the following raw materials in proportion: 40-70 parts of modified granite powder, 10-25 parts of modified fly ash and 15-35 parts of slag, wherein the total mass of the three parts is 100 parts, and the mass of the enhanced activator accounts for 0.1-0.3% of the total mass of the three parts. The granite powder composite mineral admixture has large mixing amount of granite powder and high activity of the obtained admixture. However, the disadvantages are that the modification treatment of granite powder and fly ash is needed in advance, and the process is complicated.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a high-activity ultrafine mineral admixture and a preparation method thereof, and solves the technical problem that the preparation process of the existing admixture in the prior art is complex.
In order to achieve the technical purpose, the first solution of the invention provides a high-activity ultrafine mineral admixture, which comprises the following raw materials in percentage by weight:
20-60% of granite powder, 5-25% of furnace slag, 20-50% of fly ash, 0.1-10% of excitant, 0.1-3% of reinforced activating material and 1-5% of desulfurized gypsum.
The second solution of the invention provides a preparation method of a high-activity ultrafine mineral admixture, which comprises the following steps: a drying process, a material mixing process, a coarse grinding process and a fine grinding process;
the preparation method of the high-activity ultrafine mineral admixture is used for preparing the high-activity ultrafine mineral admixture provided in the first solution of the invention.
Compared with the prior art, the invention has the beneficial effects that:
the high-activity ultrafine mineral admixture is prepared by mixing the granite powder, the furnace slag, the fly ash, the excitant, the reinforced activating material and the desulfurized gypsum, and performing coarse grinding and fine grinding, and the preparation process is simple, and the high-activity ultrafine mineral admixture reaches the standard of above S95 level.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
For the first solution of the invention, the invention provides a high-activity ultrafine mineral admixture which is composed of the following raw materials in percentage by weight:
20-60% of granite powder, 5-25% of furnace slag, 20-50% of fly ash, 0.1-10% of excitant, 0.1-3% of reinforced activating material and 1-5% of desulfurized gypsum. The granite powder and the slag are dried granite powder and slag, the water content is less than or equal to 3%, the excitant is one or more of portland cement clinker and portland cement (P.O42.5R, P.O52.5/P.O52.5R, P.O62.5 and PI 42.5R, P II 42.5R), and the reinforcing and activating material is one or more of calcium formate, silicon ash or sodium silicate.
In the invention, the granite powder, the furnace slag, the fly ash and the desulfurized gypsum are mixed together according to the proportion to play the synergistic effect among the raw materials, so that the components of silicon-aluminum-calcium in the system are matched, the hydration is convenient to form more hydrated calcium silicate gel, and the concrete strength is favorably improved; meanwhile, calcium ions and sodium ions in the exciting agent and the enhanced activating material are used as seed crystals, so that the hydration potential barrier is reduced, the alkalinity of a hydration microenvironment is improved, the glass bodies in the fly ash and the slag are disintegrated and rehydrated, and the improvement of the hydration activity is facilitated.
Specifically, the granite powder comprises the following components in percentage by mass: SiO 2275～90％，Al2O38～15％，Fe2O30.1-3%, CaO 0.1-3%, MgO 2-5%, and loss on ignition 0.1-1%; the specific surface area of the granite powder is 300-400 m2Per kg; the slag comprises the following components in percentage by mass: SiO 2250～60％，Al2O315～25％，Fe2O33～5％，CaO 3～8％，MgO 0.1～5％，SO30.1-0.5% and 5-15% of ignition loss; ratio of the above slagThe surface area is 100 to 150m2Per kg; the fly ash comprises the following components in percentage by mass: SiO 2253～65％，Al2O320～30％，Fe2O32～5％，CaO 2～5％，MgO 1～3％，SO30.1-0.5% and loss on ignition of 1-5%; the specific surface area of the fly ash is 180-250 m2Per kg; the content of calcium sulfate dihydrate of the desulfurized gypsum is 85-95%; the specific surface area of the desulfurized gypsum is 80-120 m2Per kg; the specific surface area of the exciting agent is 300-400 m2Per kg; the specific surface area of the reinforced activation material is 50-400 m2/kg；
For the second solution of the invention, the invention provides a preparation method of a high-activity ultrafine mineral admixture, which comprises the following steps:
the method comprises a drying process, a material mixing process, a coarse grinding process and a fine grinding process. The drying process specifically comprises the steps of drying the granite powder and the slag until the moisture content is less than or equal to 3%, so that the influence on smooth grinding process caused by overlarge humidity of the raw materials in the grinding process is avoided, and preferably, the granite powder and the slag are independently dried; the material mixing process specifically comprises the steps of mixing dried granite powder, dried furnace slag, fly ash, a reinforcing activation material, an exciting agent and desulfurized gypsum in proportion to obtain a first mixture; the coarse grinding process comprises grinding the first mixture to specific surface area of 400m or more2Kg, obtaining a second mixture; the fine grinding process comprises grinding the second mixture to specific surface area of not less than 700m2And/kg, obtaining the high-activity ultrafine mineral admixture. Specifically, in the coarse grinding procedure, the diameter of the steel ball or steel forging is 5-17 mm, the rotating speed of the ball mill is 60-120 r/min, and the coarse grinding time is 30-1 h; in the fine grinding procedure, the diameter of the steel ball or steel forging is 0.8-9 mm, the rotating speed of the ball mill is 60-200 r/min, and the fine grinding time is 30 min-2 h. It should be noted that, when the steel forging is selected, the length-diameter ratio of the steel forging is 1:1 in the coarse grinding process and the fine grinding process. Preferably, in the coarse grinding step, the steel balls or steel forgings include 6mm, 8mm, 10mm, 14mm and 16mm, and the weight ratio is (5-7): 6-8): 5-7): 2-4): 1-2, respectively, the above-mentionedIn the fine grinding procedure, the steel balls or steel forgings comprise 0.8mm, 2mm, 4mm, 6mm and 8mm, and the corresponding weight ratio is (7-9): 4-6): 2-4): 1-3): 1-2; more preferably, in the coarse grinding step, the steel balls or steel forgings are 6mm, 8mm, 10mm, 14mm and 16mm in a weight ratio of 6:7:6:3: 1; in the fine grinding process, the steel balls or steel forgings are 0.8mm, 2mm, 4mm, 6mm and 8mm, and the corresponding weight ratio is 8:5:3:2:1 respectively.
In the grinding process, the materials are reduced from big to small and thinned from rough, and the small particles are agglomerated, even are pasted with balls and ground with the increase of the specific surface area and the breakage of the Si-O, Al-O chemical bond after grinding to a certain degree; the particle size distribution of the materials such as granite powder and the like is bimodal due to the differences of the particle size, grindability, moisture and temperature, the particles are relatively fine and finer, and the particles are relatively coarse and coarse, so that the particle size requirement cannot be met; if the grinding is not continued, the granularity of the material does not reach the quality standard, and if the grinding is continued, the over-grinding of the material is easily caused, so that the energy waste and the production cost are increased, and the performance of the cement and the concrete is also influenced. Therefore, the process conditions of the grinding process need to be strictly controlled, so as to prepare the high-activity ultrafine mineral admixture.
As can be seen from the above, the rough grinding process and the fine grinding process are important to the present invention. The purpose of coarse grinding is to break up the large particles agglomerated together in the powder as much as possible, the coarse grinding time is too long, soft agglomeration is caused, energy consumption is increased, and the coarse grinding time is too short, so that the agglomerated particles cannot be broken up. The purpose of fine grinding is to further reduce the diameter of the scattered large-particle materials, so that the specific surface area of the large-particle materials meets the requirement, and if the fine grinding time is too long or too short, the specific surface area cannot be guaranteed to meet the requirement. Meanwhile, in the invention, the activity can be excited in the grinding process, and Si-O and Al-O bonds of the material are destroyed, so that the hydration activity is further improved. In addition, in the grinding process, a grinding aid medium is not required to be additionally added, and the granite powder can play a role of the grinding aid medium, so that the problem that the grindability of the raw materials is different is effectively solved, and the grinding efficiency is improved.
It should be noted that, after the coarse grinding process and the fine grinding process are finished, the powder needs to be sieved, so as to remove broken steel balls in the powder.
For avoiding redundancy, the raw materials used in the following examples of the present invention are summarized as follows:
the granite powder comprises the following components in percentage by mass: SiO 2275～90％，Al2O38～15％，Fe2O30.1-3%, CaO 0.1-3%, MgO 2-5%, and loss on ignition 0.1-1%; the initial water content of the granite powder is 15-20%, and the water content of the granite powder after drying is about 3%; before grinding, the specific surface area of the granite powder is 300-400 m2/kg；
The slag comprises the following components in percentage by mass: SiO 2250～60％，Al2O315～25％，Fe2O33～5％，CaO 3～8％，MgO 0.1～5％，SO30.1-0.5% and 5-15% of ignition loss; the initial water content of the furnace slag is 25-30%, and the water content of the furnace slag after drying is about 3%; before grinding, the specific surface area of the furnace slag is 100-150 m2/kg；
The fly ash comprises the following components in percentage by mass: SiO 2253～65％，Al2O320～30％，Fe2O32～5％，CaO 2～5％，MgO 1～3％，SO30.1-0.5% and loss on ignition of 1-5%; before grinding, the specific surface area of the fly ash is 180-250 m2/kg；
The content of calcium sulfate dihydrate of the desulfurized gypsum is 85-95%; before grinding, the specific surface area of the desulfurized gypsum is 80-120 m2/kg；
Before grinding, the used excitant is silicate cement clinker, and the specific surface area of the used excitant is 300-400 m2Per kg; the used reinforced activating material is calcium formate, and the specific surface area of the reinforced activating material is 50-400 m2/kg；
In the coarse grinding process, the steel balls or steel forgings comprise 6mm, 8mm, 10mm, 14mm and 16mm, and the corresponding weight ratio is 6:7:6:3:1 respectively; wherein when the steel forging is selected, the length-diameter ratio of the steel forging is 1: 1; the rotation speed of the ball mill is 80 r/min.
In the fine grinding process, the steel balls or steel forgings are 0.8mm, 2mm, 4mm, 6mm and 8mm, and the corresponding weight ratio is 8:5:3:2:1 respectively. Wherein when the steel forging is selected, the length-diameter ratio of the steel forging is 1: 1; the rotation speed of the ball mill is 120 r/min.
Examples 1 to 5
Examples 1-5 provide 5 different high activity ultra fine mineral admixtures, respectively, obtained by the steps of:
mixing the dried granite powder, the dried furnace slag, the fly ash, the excitant, the reinforced activating material and the desulfurized gypsum according to a certain proportion, and sequentially carrying out coarse grinding, sieving, fine grinding and sieving to obtain the high-activity ultrafine mineral admixture.
The raw material ratios and the process parameters of the high-activity ultrafine mineral admixtures obtained in examples 1 to 5 are shown in Table 1.
TABLE 1
As can be seen from Table 1, by using the raw materials of the present invention and strictly controlling the process parameters of the present invention, such as steel ball or steel forging gradation, ball milling time, etc., the specific surface area of the obtained material is not less than 700m2Perkg of high-activity superfine mineral admixture.
Test groups 1 to 5
The concrete performance test of the high-activity ultrafine mineral admixture in the embodiment 1-5 is carried out by referring to GB/T18046-2017 granulated blast furnace slag powder used in cement, mortar and concrete. Wherein, the reference cement selects PO42.5 ordinary portland cement, the selected sand is the Chinese ISO standard sand, and the proportions of all ingredients are as follows: 225g of cement, 450g of standard sand, 225g of high-activity ultrafine mineral admixture and 225g of water. The standard control group comprises 450g of cement, 450g of standard sand and 225g of water. The test results are shown in Table 2. The high activity ultrafine mineral admixtures of examples 1 to 5 were used in test groups 1 to 5, respectively.
TABLE 2
As can be seen from Table 2, the 7d activity index and the 28d activity index of the high-activity ultrafine mineral admixtures in the embodiments 1 to 5 of the invention are 70 to 90 percent and 95 to 110 percent, which reach the standard of above S95 grade.
Compared with the prior art, the invention has the beneficial effects that:
the high-activity ultrafine mineral admixture is prepared by mixing the granite powder, the slag, the fly ash, the excitant, the reinforced activating material and the desulfurized gypsum, and performing coarse grinding and fine grinding, and the preparation process is simple, and the high-activity ultrafine mineral admixture reaches the standard of more than S95 grade;
the raw materials in the invention are mainly derived from various solid wastes, and the resource recovery rate is high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The high-activity superfine mineral admixture is characterized by comprising the following raw materials in percentage by weight:
20-60% of granite powder, 5-25% of furnace slag, 20-50% of fly ash, 0.1-10% of excitant, 0.1-3% of reinforced activating material and 1-5% of desulfurized gypsum.
2. The high-activity ultrafine mineral admixture as defined in claim 1, wherein said activator is one or more of portland cement clinker and portland cement; the reinforced activating material is one or more of calcium formate, silica fume or sodium silicate.
3. The high-activity ultrafine mineral admixture as claimed in claim 1, wherein the granite powder comprises the following components in percentage by mass: SiO 2275～90％，Al2O38～15％，Fe2O30.1-3%, CaO 0.1-3%, MgO 2-5%, and loss on ignition 0.1-1%;
the slag comprises the following components in percentage by mass: SiO 2250～60％，Al2O315～25％，Fe2O33～5％，CaO3～8％，MgO 0.1～5％，SO30.1-0.5% and 5-15% of ignition loss;
the fly ash comprises the following components in percentage by mass: SiO 2253～65％，Al2O320～30％，Fe2O32～5％，CaO 2～5％，MgO 1～3％，SO30.1-0.5% and loss on ignition of 1-5%;
the content of the calcium sulfate dihydrate in the desulfurized gypsum is 85-95%.
4. The preparation method of the high-activity ultrafine mineral admixture is characterized by comprising the following steps: a drying process, a material mixing process, a coarse grinding process and a fine grinding process;
the preparation method of the high-activity ultrafine mineral admixture is used for preparing the high-activity ultrafine mineral admixture as defined in any one of claims 1 to 3.
5. The method for preparing the high-activity ultrafine mineral admixture according to claim 4, wherein the coarse grinding step is to grind the mixture obtained after the mixing step to a specific surface area of 400m or more2/kg。
6. The method for preparing the high-activity ultrafine mineral admixture according to claim 5, wherein in the coarse grinding process, the diameter of the steel ball or steel forging is 5 mm-17 mm, the rotation speed of the ball mill is 60-120 r/min, and the coarse grinding time is 30 min-1 h.
7. The method of claim 6, wherein the steel balls or steel forgings used in the coarse grinding step comprise 6mm, 8mm, 10mm, 14mm and 16mm, and the weight ratio is (5-7): 6-8): 5-7): 2-4): 1-2.
8. The method according to claim 4, wherein the fine grinding step is a step of grinding the mixture obtained by the coarse grinding step to a specific surface area of not less than 700m2/kg。
9. The method for preparing the high-activity ultrafine mineral admixture according to claim 8, wherein in the fine grinding step, the diameter of the steel ball or steel ball is 0.8mm to 9mm, the rotation speed of the ball mill is 60 r/min to 200r/min, and the fine grinding time is 30min to 2 h.
10. The method of claim 9, wherein the steel balls or steel forgings used in the fine grinding step comprise 0.8mm, 2mm, 4mm, 6mm and 8mm, and the weight ratio is (7-9): 4-6): 2-4): 1-3): 1-2.
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